Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
[linux-2.6] / net / sunrpc / auth_null.c
1 /*
2  * linux/net/sunrpc/auth_null.c
3  *
4  * AUTH_NULL authentication. Really :-)
5  *
6  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7  */
8
9 #include <linux/types.h>
10 #include <linux/module.h>
11 #include <linux/utsname.h>
12 #include <linux/sunrpc/clnt.h>
13 #include <linux/sched.h>
14
15 #ifdef RPC_DEBUG
16 # define RPCDBG_FACILITY        RPCDBG_AUTH
17 #endif
18
19 static struct rpc_auth null_auth;
20 static struct rpc_cred null_cred;
21
22 static struct rpc_auth *
23 nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
24 {
25         atomic_inc(&null_auth.au_count);
26         return &null_auth;
27 }
28
29 static void
30 nul_destroy(struct rpc_auth *auth)
31 {
32 }
33
34 /*
35  * Lookup NULL creds for current process
36  */
37 static struct rpc_cred *
38 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
39 {
40         return get_rpccred(&null_cred);
41 }
42
43 /*
44  * Destroy cred handle.
45  */
46 static void
47 nul_destroy_cred(struct rpc_cred *cred)
48 {
49 }
50
51 /*
52  * Match cred handle against current process
53  */
54 static int
55 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
56 {
57         return 1;
58 }
59
60 /*
61  * Marshal credential.
62  */
63 static u32 *
64 nul_marshal(struct rpc_task *task, u32 *p)
65 {
66         *p++ = htonl(RPC_AUTH_NULL);
67         *p++ = 0;
68         *p++ = htonl(RPC_AUTH_NULL);
69         *p++ = 0;
70
71         return p;
72 }
73
74 /*
75  * Refresh credential. This is a no-op for AUTH_NULL
76  */
77 static int
78 nul_refresh(struct rpc_task *task)
79 {
80         task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
81         return 0;
82 }
83
84 static u32 *
85 nul_validate(struct rpc_task *task, u32 *p)
86 {
87         rpc_authflavor_t        flavor;
88         u32                     size;
89
90         flavor = ntohl(*p++);
91         if (flavor != RPC_AUTH_NULL) {
92                 printk("RPC: bad verf flavor: %u\n", flavor);
93                 return NULL;
94         }
95
96         size = ntohl(*p++);
97         if (size != 0) {
98                 printk("RPC: bad verf size: %u\n", size);
99                 return NULL;
100         }
101
102         return p;
103 }
104
105 struct rpc_authops authnull_ops = {
106         .owner          = THIS_MODULE,
107         .au_flavor      = RPC_AUTH_NULL,
108 #ifdef RPC_DEBUG
109         .au_name        = "NULL",
110 #endif
111         .create         = nul_create,
112         .destroy        = nul_destroy,
113         .lookup_cred    = nul_lookup_cred,
114 };
115
116 static
117 struct rpc_auth null_auth = {
118         .au_cslack      = 4,
119         .au_rslack      = 2,
120         .au_ops         = &authnull_ops,
121         .au_flavor      = RPC_AUTH_NULL,
122         .au_count       = ATOMIC_INIT(0),
123 };
124
125 static
126 struct rpc_credops      null_credops = {
127         .cr_name        = "AUTH_NULL",
128         .crdestroy      = nul_destroy_cred,
129         .crmatch        = nul_match,
130         .crmarshal      = nul_marshal,
131         .crrefresh      = nul_refresh,
132         .crvalidate     = nul_validate,
133 };
134
135 static
136 struct rpc_cred null_cred = {
137         .cr_ops         = &null_credops,
138         .cr_count       = ATOMIC_INIT(1),
139         .cr_flags       = RPCAUTH_CRED_UPTODATE,
140 #ifdef RPC_DEBUG
141         .cr_magic       = RPCAUTH_CRED_MAGIC,
142 #endif
143 };